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狄親王妹紅鸞郡主入質金邦期滿，如今返回宋土，與她兩情相悅的耶律將軍護航，二人離別之際唱起《胡地蠻歌》。途中他們救起一名飄浮海中的女子，未幾流寇洗劫官船，眾人各自逃亡失散。狄親王手下奉命迎接郡主不果，卻見一女子身披郡主斗篷浮沉海中，後誤將她作郡主接回王府。耶律將軍亦化名陸君雄到中原尋找郡主。另邊廂倪思安在岸邊哀悼為情投海的女兒倪秀鈿，恰巧救起失憶的紅鸞。此時尚書兒子尚全孝高中文狀元而回，尚母早年與倪思安定下子女婚約，倪氏遂帶同紅鸞往尚府就親。君雄輾轉考得武狀元，獲尚書賞識邀往尚府暫住。時狄親王欲尋人翻譯郡主帶回的番文書信，思安命女兒假扮男裝前往讀信。紅鸞竟能讀通番文，狄親王大為賞識欲封紅鸞為駙馬。而被錯認郡主的女子正是倪秀鈿，她於新婚之夜與愛人全孝相逢，未幾她與紅鸞分別產下孩子。為怕王爺降罪，倪氏建議尚母將兩嬰認作親生。王爺命君雄連夜開審此奇案，各人以為倪氏為尚母姦夫。時秀鈿及紅鸞到公堂認回孩子，君雄身份被揭破，王爺欲加治罪。絕望中君雄唱出《胡地蠻歌》，令紅鸞回復記憶，全劇最後團圓結局。
The Princess in Distress
Having lived as a hostage in Jin for years, Hongluan, sister of Prince Di, returns to Song. She is escorted by her lover, General Yelü from Jin. As they part with each other, they sing “The Barbarian’s Song.” On the way home, Hongluan’s men rescue a woman from the sea. Soon bandits come to plunder the ship, and the people aboard scatter. Prince Di’s men, while failing to find Hongluan, see a woman floating on the sea inHongluan’s cape. They assume her to be the princess, and take her to the prince’s house.
General Yelü, using the alias Lu Junxiong, comes to the Central Plains in search of Hongluan. On the other shore, Ni Si’an mourns his lovesick daughter, Ni Xiudian, who has jumped into the sea because of a broken heart. He happens to rescue Hongluan, who now has lost her memory. Shang Quanxiao, son of a minister, returns after coming out first in the highest imperial examination. Since Shang’s mother has promised to marry him to Ni Si’an’s daughter, Si’an takes Hongluan to Shang‘s home in his daughter’s place.
Junxiong, also taking the imperial examination, manages to come out first in the examination for military officers. The minister takes a liking to him and invites him to stay in his house. Learning that Prince Di is looking for someone to translate the letter in a foreign language brought back by his “sister,” Si’an hasHongluan disguise herself as a man and offer her services. Impressed by her ability to read the letter, the prince decides to marry Hongluan to his “sister.”
The woman who has been mistaken for the prince’s sister is none other than Ni Xiudian. On the wedding night, she meets her lover Quanxiao. In time she gives birth to a baby and so does Hongluan. Fearing the prince’s punishment, Ni Si’an advises Quanxiao’s mother to pretend that both babies are her own children. The prince orders the strange case be tried by Junxiong before daybreak. All believe that Si’an andQuanxiao’s mother are guilty of adultery. Xiudian and Hongluan come to the court to claim their babies, andJunxiong’s identity is revealed. As the prince decides to execute punishment on him, he sings “The Barbarian’s Song”in desperation, reviving Hongluan‘s memory.